Even though many people think that cats are very independent, they do get lonely or even bored while you're away from home. I think that if you can adopting either 2 adult cats or 2 kittens together would be the best solution. Many rescue groups won't even consider adopting out a kitten by itself unless you already have another cat at home. I just adopted 3 kittens a little over 3 weeks ago and even though some of my other cats play with them they also still have each other to play with and hang out with. It works out for the better all the way around. Good luck.